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/* microprotocols.c - minimalist and non-validating protocols implementation
 * Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
 * This file is part of psycopg and was adapted for pysqlite. Federico Di
 * Gregorio gave the permission to use it within pysqlite under the following
 * license:
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
#include <Python.h>
#include <structmember.h>
#include "cursor.h"
#include "microprotocols.h"
#include "prepare_protocol.h"
/** the adapters registry **/
PyObject *psyco_adapters;
/* pysqlite_microprotocols_init - initialize the adapters dictionary */
pysqlite_microprotocols_init(PyObject *dict)
    /* create adapters dictionary and put it in module namespace */
    if ((psyco_adapters = PyDict_New()) == NULL) {
        return -1;
    return PyDict_SetItemString(dict, "adapters", psyco_adapters);
/* pysqlite_microprotocols_add - add a reverse type-caster to the dictionary */
pysqlite_microprotocols_add(PyTypeObject *type, PyObject *proto, PyObject *cast)
    PyObject* key;
    int rc;
    if (proto == NULL) proto = (PyObject*)&pysqlite_PrepareProtocolType;
    key = Py_BuildValue("(OO)", (PyObject*)type, proto);
    if (!key) {
        return -1;
    rc = PyDict_SetItem(psyco_adapters, key, cast);
    Py_DECREF(key);
    return rc;
/* pysqlite_microprotocols_adapt - adapt an object to the built-in protocol */
pysqlite_microprotocols_adapt(PyObject *obj, PyObject *proto, PyObject *alt)
    PyObject *adapter, *key;
    /* we don't check for exact type conformance as specified in PEP 246
       because the pysqlite_PrepareProtocolType type is abstract and there is no
       way to get a quotable object to be its instance */
    /* look for an adapter in the registry */
    key = Py_BuildValue("(OO)", (PyObject*)obj->ob_type, proto);
    if (!key) {
        return NULL;
    adapter = PyDict_GetItem(psyco_adapters, key);
    Py_DECREF(key);
    if (adapter) {
        PyObject *adapted = PyObject_CallFunctionObjArgs(adapter, obj, NULL);
        return adapted;
    /* try to have the protocol adapt this object*/
    if (PyObject_HasAttrString(proto, "__adapt__")) {
        _Py_IDENTIFIER(__adapt__);
        PyObject *adapted = _PyObject_CallMethodId(proto, &PyId___adapt__, "O", obj);
        if (adapted) {
            if (adapted != Py_None) {
                return adapted;
            } else {
                Py_DECREF(adapted);
        if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError))
            return NULL;
    /* and finally try to have the object adapt itself */
    if (PyObject_HasAttrString(obj, "__conform__")) {
        _Py_IDENTIFIER(__conform__);
        PyObject *adapted = _PyObject_CallMethodId(obj, &PyId___conform__,"O", proto);
        if (adapted) {
            if (adapted != Py_None) {
                return adapted;
            } else {
                Py_DECREF(adapted);
        if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError)) {
            return NULL;
    /* else set the right exception and return NULL */
    PyErr_SetString(pysqlite_ProgrammingError, "can't adapt");
    return NULL;
/** module-level functions **/
pysqlite_adapt(pysqlite_Cursor *self, PyObject *args)
    PyObject *obj, *alt = NULL;
    PyObject *proto = (PyObject*)&pysqlite_PrepareProtocolType;
    if (!PyArg_ParseTuple(args, "O|OO", &obj, &proto, &alt)) return NULL;
    return pysqlite_microprotocols_adapt(obj, proto, alt);
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